Fujitsu Corporation

Mitsuo Takamatsu

Takashi Matsuda

Yoshio Satoh

Osamu Ikata

Tsutomu Miyashita

A SAW filter includes a first SAW resonator having a pair of terminals and a predetermined resonance frequency (f), the first SAW resonator being provided in a parallel arm of the SAW filter. A second SAW resonator has a pair of terminals and a predetermined resonance frequency (f) approximately equal to a predetermined antiresonance frequency of the first SAW resonator (f). The second SAW resonator is provided in a series arm of the SAW filter. An inductance element is connected in series to the first SAW resonator.

Surface acoustic wave filter

A SAW filter includes a first SAW resonator having a pair of terminals and a predetermined resonance frequency (f ), the first SAW resonator being provided in a parallel arm of the SAW filter. A second SAW resonator has a pair of terminals and a predetermined resonance frequency (f ) approximately equal to a predetermined antiresonance frequency of the first SAW resonator (f ). The second SAW resonator is provided in a series arm of the SAW filter. An inductance element is connected in series to the first SAW resonator.

A SAW filter includes a first SAW resonator having a pair of terminals and a predetermined resonance frequency (f.sub.rp), the first SAW resonator being provided in a parallel arm of the SAW filter. A second SAW resonator has a pair of terminals and a predetermined resonance frequency (f.sub.rs) approximately equal to a predetermined antiresonance frequency of the first SAW resonator (f.sub.ap). The second SAW resonator is provided in a series arm of the SAW filter. An inductance element is connected in series to the first SAW resonator.

A surface acoustic wave device comprises a pair of multiple-electrode surface acoustic wave elements that are mirror-symmetrically arranged and disposed on a piezoelectric substrate. Each of the multiple-electrode surface acoustic wave elements comprises a plurality of input/output inter-digital transducers and connected inter-digital transducers. The number of the input/output inter-digital transducers is equal to or smaller by one, than the number of the connected inter-digital transducers, so that insertion loss of the surface acoustic wave device can be reduced without increasing the size of the device.

Surface acoustic wave device for band-pass filter having small insertion

A surface acoustic wave device in which a surface acoustic wave device element is arranged with interdigital electrodes on a piezoelectric substrate is packaged in a package provided in a metal pattern. Metal bumps are formed on a bonding pad section of the surface wave device element and the metal bumps are contact connected with the metal pattern of the package.

Surface acoustic wave device with improved junction bonding and package

A SAW device comprises a substrate, input and output interdigital electrodes provided on the substrate alternately to form a row of electrodes, and a pair of open strip reflectors disposed at both ends of the row, the input interdigital electrodes having a first pair number representing the number of pairs of opposing finger electrodes forming the input electrode, the output interdigital electrodes having a second pair number representing the number of pairs of opposing finger electrodes forming the output electrode, wherein the first pair number and second pair number are set different in the adjacent input and output electrodes with a predetermined ratio therebetween, the first pair number is changed in each input electrodes in the row, and the second pair number is changed in each output electrodes in the row.

Growing community of inventors

Kawasaki, Japan

Mitsuo Takamatsu